From 32603266e5688718faad35b7502aa0b72a42764a Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Wed, 23 Jan 2019 22:16:53 -0700 Subject: [PATCH] C++ify remote notification code This C++ifies the remote notification code -- replacing function pointers with virtual methods and using unique_ptr. This allows for the removal of some cleanups. 2019-03-06 Tom Tromey * remote.c (struct stop_reply_deleter): Remove. (stop_reply_up): Update. (struct stop_reply): Derive from notif_event. Don't typedef. : Now a std::vector. (stop_reply_xfree): Remove. (stop_reply::~stop_reply): Rename from stop_reply_dtr. (remote_notif_stop_alloc_reply): Return a unique_ptr. Use new. (remote_target::discard_pending_stop_replies): Use delete. (remote_target::remote_parse_stop_reply): Update. (remote_target::process_stop_reply): Update. * remote-notif.h (struct notif_event): Add virtual destructor. Remove "dtr" member. (struct notif_client) : Return a unique_ptr. (notif_event_xfree): Don't declare. (notif_event_up): New typedef. * remote-notif.c (remote_notif_ack, remote_notif_parse): Update. (notif_event_xfree, do_notif_event_xfree): Remove. (remote_notif_state_xfree): Update. --- gdb/ChangeLog | 21 ++++++++++++ gdb/remote-notif.c | 42 ++++-------------------- gdb/remote-notif.h | 15 +++++---- gdb/remote.c | 80 +++++++++++++--------------------------------- 4 files changed, 59 insertions(+), 99 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index f7f30b3aa1..2d7e328952 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,24 @@ +2019-03-06 Tom Tromey + + * remote.c (struct stop_reply_deleter): Remove. + (stop_reply_up): Update. + (struct stop_reply): Derive from notif_event. Don't typedef. + : Now a std::vector. + (stop_reply_xfree): Remove. + (stop_reply::~stop_reply): Rename from stop_reply_dtr. + (remote_notif_stop_alloc_reply): Return a unique_ptr. Use new. + (remote_target::discard_pending_stop_replies): Use delete. + (remote_target::remote_parse_stop_reply): Update. + (remote_target::process_stop_reply): Update. + * remote-notif.h (struct notif_event): Add virtual destructor. + Remove "dtr" member. + (struct notif_client) : Return a unique_ptr. + (notif_event_xfree): Don't declare. + (notif_event_up): New typedef. + * remote-notif.c (remote_notif_ack, remote_notif_parse): Update. + (notif_event_xfree, do_notif_event_xfree): Remove. + (remote_notif_state_xfree): Update. + 2019-03-06 Tom Tromey * infrun.c (displaced_step_clear_cleanup): Now a diff --git a/gdb/remote-notif.c b/gdb/remote-notif.c index ae9a94d9c9..eece947006 100644 --- a/gdb/remote-notif.c +++ b/gdb/remote-notif.c @@ -52,8 +52,6 @@ static struct notif_client *notifs[] = gdb_static_assert (ARRAY_SIZE (notifs) == REMOTE_NOTIF_LAST); -static void do_notif_event_xfree (void *arg); - /* Parse the BUF for the expected notification NC, and send packet to acknowledge. */ @@ -61,18 +59,14 @@ void remote_notif_ack (remote_target *remote, struct notif_client *nc, const char *buf) { - struct notif_event *event = nc->alloc_event (); - struct cleanup *old_chain - = make_cleanup (do_notif_event_xfree, event); + notif_event_up event = nc->alloc_event (); if (notif_debug) fprintf_unfiltered (gdb_stdlog, "notif: ack '%s'\n", nc->ack_command); - nc->parse (remote, nc, buf, event); - nc->ack (remote, nc, buf, event); - - discard_cleanups (old_chain); + nc->parse (remote, nc, buf, event.get ()); + nc->ack (remote, nc, buf, event.release ()); } /* Parse the BUF for the expected notification NC. */ @@ -81,17 +75,14 @@ struct notif_event * remote_notif_parse (remote_target *remote, struct notif_client *nc, const char *buf) { - struct notif_event *event = nc->alloc_event (); - struct cleanup *old_chain - = make_cleanup (do_notif_event_xfree, event); + notif_event_up event = nc->alloc_event (); if (notif_debug) fprintf_unfiltered (gdb_stdlog, "notif: parse '%s'\n", nc->name); - nc->parse (remote, nc, buf, event); + nc->parse (remote, nc, buf, event.get ()); - discard_cleanups (old_chain); - return event; + return event.release (); } DEFINE_QUEUE_P (notif_client_p); @@ -216,25 +207,6 @@ handle_notification (struct remote_notif_state *state, const char *buf) } } -/* Invoke destructor of EVENT and xfree it. */ - -void -notif_event_xfree (struct notif_event *event) -{ - if (event != NULL && event->dtr != NULL) - event->dtr (event); - - xfree (event); -} - -/* Cleanup wrapper. */ - -static void -do_notif_event_xfree (void *arg) -{ - notif_event_xfree ((struct notif_event *) arg); -} - /* Return an allocated remote_notif_state. */ struct remote_notif_state * @@ -269,7 +241,7 @@ remote_notif_state_xfree (struct remote_notif_state *state) delete_async_event_handler (&state->get_pending_events_token); for (i = 0; i < REMOTE_NOTIF_LAST; i++) - notif_event_xfree (state->pending_event[i]); + delete state->pending_event[i]; xfree (state); } diff --git a/gdb/remote-notif.h b/gdb/remote-notif.h index d7663274a4..87b52a18f9 100644 --- a/gdb/remote-notif.h +++ b/gdb/remote-notif.h @@ -20,17 +20,22 @@ #ifndef REMOTE_NOTIF_H #define REMOTE_NOTIF_H +#include #include "common/queue.h" /* An event of a type of async remote notification. */ struct notif_event { - /* Destructor. Release everything from SELF, but not SELF - itself. */ - void (*dtr) (struct notif_event *self); + virtual ~notif_event () + { + } }; +/* A unique pointer holding a notif_event. */ + +typedef std::unique_ptr notif_event_up; + /* ID of the notif_client. */ enum REMOTE_NOTIF_ID @@ -70,7 +75,7 @@ typedef struct notif_client struct notif_client *self); /* Allocate an event. */ - struct notif_event *(*alloc_event) (void); + notif_event_up (*alloc_event) (); /* Id of this notif_client. */ const enum REMOTE_NOTIF_ID id; @@ -112,8 +117,6 @@ struct notif_event *remote_notif_parse (remote_target *remote, notif_client *nc, const char *buf); -void notif_event_xfree (struct notif_event *event); - void handle_notification (struct remote_notif_state *notif_state, const char *buf); diff --git a/gdb/remote.c b/gdb/remote.c index bed997c6ad..7d556add0d 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -96,17 +96,7 @@ struct protocol_feature; struct packet_reg; struct stop_reply; -static void stop_reply_xfree (struct stop_reply *); - -struct stop_reply_deleter -{ - void operator() (stop_reply *r) const - { - stop_reply_xfree (r); - } -}; - -typedef std::unique_ptr stop_reply_up; +typedef std::unique_ptr stop_reply_up; /* Generic configuration support for packets the stub optionally supports. Allows the user to specify the use of the packet as well @@ -6813,11 +6803,9 @@ remote_console_output (const char *msg) gdb_flush (gdb_stdtarg); } -DEF_VEC_O(cached_reg_t); - -typedef struct stop_reply +struct stop_reply : public notif_event { - struct notif_event base; + ~stop_reply (); /* The identifier of the thread about this event */ ptid_t ptid; @@ -6836,20 +6824,14 @@ typedef struct stop_reply efficient for those targets that provide critical registers as part of their normal status mechanism (as another roundtrip to fetch them is avoided). */ - VEC(cached_reg_t) *regcache; + std::vector regcache; enum target_stop_reason stop_reason; CORE_ADDR watch_data_address; int core; -} *stop_reply_p; - -static void -stop_reply_xfree (struct stop_reply *r) -{ - notif_event_xfree ((struct notif_event *) r); -} +}; /* Return the length of the stop reply queue. */ @@ -6901,30 +6883,16 @@ remote_notif_stop_can_get_pending_events (remote_target *remote, return 0; } -static void -stop_reply_dtr (struct notif_event *event) +stop_reply::~stop_reply () { - struct stop_reply *r = (struct stop_reply *) event; - cached_reg_t *reg; - int ix; - - for (ix = 0; - VEC_iterate (cached_reg_t, r->regcache, ix, reg); - ix++) - xfree (reg->data); - - VEC_free (cached_reg_t, r->regcache); + for (cached_reg_t ® : regcache) + xfree (reg.data); } -static struct notif_event * -remote_notif_stop_alloc_reply (void) +static notif_event_up +remote_notif_stop_alloc_reply () { - /* We cast to a pointer to the "base class". */ - struct notif_event *r = (struct notif_event *) XNEW (struct stop_reply); - - r->dtr = stop_reply_dtr; - - return r; + return notif_event_up (new struct stop_reply ()); } /* A client of notification Stop. */ @@ -7067,7 +7035,7 @@ remote_target::discard_pending_stop_replies (struct inferior *inf) /* Discard the in-flight notification. */ if (reply != NULL && reply->ptid.pid () == inf->pid) { - stop_reply_xfree (reply); + delete reply; rns->pending_event[notif_client_stop.id] = NULL; } @@ -7211,7 +7179,7 @@ remote_target::remote_parse_stop_reply (const char *buf, stop_reply *event) event->ws.kind = TARGET_WAITKIND_IGNORE; event->ws.value.integer = 0; event->stop_reason = TARGET_STOPPED_BY_NO_REASON; - event->regcache = NULL; + event->regcache.clear (); event->core = -1; switch (buf[0]) @@ -7447,7 +7415,7 @@ Packet: '%s'\n"), if (fieldsize < register_size (event->arch, reg->regnum)) warning (_("Remote reply is too short: %s"), buf); - VEC_safe_push (cached_reg_t, event->regcache, &cached_reg); + event->regcache.push_back (cached_reg); } else { @@ -7663,22 +7631,18 @@ remote_target::process_stop_reply (struct stop_reply *stop_reply, && status->kind != TARGET_WAITKIND_NO_RESUMED) { /* Expedited registers. */ - if (stop_reply->regcache) + if (!stop_reply->regcache.empty ()) { struct regcache *regcache = get_thread_arch_regcache (ptid, stop_reply->arch); - cached_reg_t *reg; - int ix; - for (ix = 0; - VEC_iterate (cached_reg_t, stop_reply->regcache, ix, reg); - ix++) - { - regcache->raw_supply (reg->num, reg->data); - xfree (reg->data); - } + for (cached_reg_t ® : stop_reply->regcache) + { + regcache->raw_supply (reg.num, reg.data); + xfree (reg.data); + } - VEC_free (cached_reg_t, stop_reply->regcache); + stop_reply->regcache.clear (); } remote_notice_new_inferior (ptid, 0); @@ -7689,7 +7653,7 @@ remote_target::process_stop_reply (struct stop_reply *stop_reply, remote_thr->vcont_resumed = 0; } - stop_reply_xfree (stop_reply); + delete stop_reply; return ptid; } -- 2.34.1